At a local hospital, a decision was made recently to downsize the nursing staff. The local television station sent a reporter and camera crew to interview the administrator regarding the impact of this action on patient care. After 20 minutes filming the interview, the reporter left. That evening a 15-second segment of the interview was shown, that left an unfavorable impression regarding the impact on quality. The administrator wondered what went wrong. Explain how more control could have been used to send out the message about the downsizing.
In maize the genes Pl for purple leaves (dominant over green leaves); sm for salmon silk ( recessive for yellow silk) and py for pigmy plant (recessive to normal size) are on chromosome 6 at positions 45, 55 and 65 respectively. Predict the proportion of gamete types from the testcross assuming no interference.
You are interested in a population of pangolins (scaly anteaters) and find that 49% of the individuals have the homozygous recessive genotype (pp) for a gene of interest. You also find that there are only two phenotypes for this trait, suggesting that the allele “P” is completely dominant over the allele “p.” Given this, determine the following:
The expected frequency of each allele, the expected frequency of each genotype, and the frequency of each phenotype
1. Imagine a population of 10,000 humans living on an isolated island. Every generation, an average of one individual is born with cystic fibrosis, a fatal genetic disease caused by a recessive allele (ie., individuals with the condition are cc, Cc individuals are unaffected, but carry the allele)
1. What are the frequencies of the dominant, and recessive alleles?
2. What proportion of the population are carriers?
3. What is the selection coefficient against individuals with the disease?
Both vasopressin and the renin-angiotensin-aldosterone system effect a rise in blood pressure in response to specific signals. In other words, at least one of the major effects of these hormones is the same. What might be the adaptive advantage of having two rather than one system involved in maintaining high blood pressure? In your answer be sure to consider what is different about the two systems as well as what is similar.
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